Refactored and improved seeds (#8695)

- Added a new Seeder service to help with custom object seeds
- Added RichTextFieldInput to edit a rich text field directly on the
table, but deactivated it for now.

packages/twenty-server/src/engine/workspace-manager/demo-objects-prefill-data/people-demo.json.ts

@@ -1,4 +1,4 @@
-import { DEMO_SEED_WORKSPACE_MEMBER_IDS } from "src/engine/workspace-manager/demo-objects-prefill-data/workspace-member";
+import { DEMO_SEED_WORKSPACE_MEMBER_IDS } from "src/engine/workspace-manager/demo-objects-prefill-data/seed-workspace-member-with-demo-data";
 
 export const peopleDemo = [
   {